我见过太多人卡在同一个地方：官方 object_detection_tutorial.ipynb 跑得通，一旦换成自己训练的模型就报各种错——路径找不到、标签对不上、 frozen_inference_graph.pb 解压逻辑把自训模型覆盖了、图片显示不出来。这些问题的根源往往不是模型本身，而是示例代码里写死了一堆"官方专用"的路径和下载逻辑。

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